Simulate mouse move

[michalstocki]

This is a Feature Proposal

Description

I need the option to perform a mouse move to be able to test the drag'n'drop feature.
I suggest to add a new api metod mousemove that could be used with pixel coordinates and chaned with the existing mousedown and mouseup methods:

await chromeless
  .mousemove(100, 20)
  .mousedown(100, 20)
  .mousemove(200, 20, {steps: 50})
  .mouseup(200, 20);

I expect the behaviour of these methods to be similar to the one in puppeteer.

Similar or dependent issues:

• Support options for click and mouse events #242

Additional Data

• Chromeless Version you're using:
• Operating System:
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